We're told the former Dallas Cowboys superstar was playing some pool with a friend near the bar area -- when a man wearing a teal T-shirt walked up to try to get a picture with The Playmaker.
Witnesses say the man who was playing with Irvin, though, told the guy to scram -- which set the dude in the teal off.
You can see in the video, the man seemed to have a huge problem with Irvin's friend ... but the ex-wide receiver eventually stepped in to get everyone to calm down.
The footage shows Irvin even hugged the guy in the teal in order to prevent a fracas.